Optimal Code Set Selection and Security Issues in Spectral Phase-Encoded Time Spreading (SPECTS) OCDMA Systems

New Zero Cross-Correlation Codes Based on Zech Method’s for OCDMA Systems

“…Finally, the pairs (0, 3), (6, 1), (5,4) corresponding to the weight code of each user obtained from Equation (3) are replaced by the ''1' in their positions as is shown in Table 3. The length of the final sequences code corresponds to the product 𝐿 = 𝐾. 𝑤, where the column with insignificant information is ignored.…”

“…In this multiplexing technique, each user in the transmitter communication channel is allocated a unique distinguishable optical code [1,2]. This technique has many advantages besides the Wavelength Division Multiplexing (OTDMA) and Time Division Multiplexing (WDM) such as higher security, flexibility, and simplicity of the network control [3][4][5]. However, the performance of the technique OCDMA is mainly dependent on a specifically codes used for encoding.…”

Performance and security analysis of novel ZCCRW codes in lower earth orbit based MDM-OWC incorporating hybrid modulations

“…Optical wireless communication (OWC) links are gaining significant stature as compared to traditional radio frequency (RF) based techniques owing to its numerous benefits such as extensive bandwidth, high speed, more security, no license need, and absence of electromagnetic interference (EMI) [2]. Nowadays, for OWC, optical code division multiple access (OCDMA) based efficient coding techniques are preferred among all the existing access techniques such as WDM and TDM, as it is a promising substitute for network access [3,4]. This technique permits flexibility and scalability for increased traffic within the aforesaid transmission link.…”

Sistemas CDMA ópticos coerentes baseados em codificação de fase espectral

“…Todos os valores de energia foram normalizados em relação ao usuário corretamente decodificado (em vermelho). As linhas tracejadas indicam o valor médio de interferência, igual a 0,141 para ambos os casos [124]. -12 .…”